LIMNJEAD.E. 251 



* * * Tentacles elongate, linear ; body and shell spiral, 

 sinistral, (Physina.) 



4. Physa. (Bubble Shell.) 

 The body spiral, on the middle of an elongate foot ; the 

 mantle large, lobed on the edge, and expanded over 

 the ovate, thin, transparent, spiral, sinistral shell, 

 which has an oblong mouth, with the inner lip ex- 

 panded and spread over the body whorl, covering 

 the axis and the smooth pillar; the tentacles have 

 an auricle at the base. 



98.1. Physa fontinalis. Stream Bubble Shell, (t. 9. 



f. 1 10.) Shell horn-colour, oval, with a very short 



obtuse spire ; aperture dilated at the base. 

 Physa fontinalis. Drop. p. 54. t. 3. f. 8, 9. ; Brard, 



p. 167. t. 7. f. 7, 8.; Lamarck, vi. ii. 156.; 



Leach, 150.; Jeffreys, Linn. Trans, xvi. 379.; 



Turton,Man. ed. 1. 127. f. 110. 

 Limnea fontinalis. Sowerby, Gen. f. 8. 

 Bulla fontinalis. Mont. p. 226. 

 Bulimus perda. O. F. Miiller, Naturfoscher 



xv. 

 Planorbis bulla. Miiller, Verm. ii. 167. 

 •Bulla fluviatilis. Turton, Conch. Diet. 

 Helix bullaeoides. Donovan, B. S. t. 168 f. 



2. ?? ; Linn. Trans, viii. p. 126. t. 4. f. 1. 

 Var. 1. Spire longer. 

 Bulla fontinalis. Linn. Trans, viii. 126. t. 4. f. 1, 



(not description). 

 Physa acuta ? J. Sowerby, not Drap. 

 Var. 2. Last whorl rather angular behind. 

 Physa alba. Jenyns, MSS., not Turton. 

 M 6 



